Create the Shipify Canvas App

In this step, we’ll expose the Shipify Web application as a canvas app.

You’ll need user permissions “Customize Application” and “Modify All Data” to create a canvas app.

In the Salesforce application, from Setup, click Create | Apps.
In the Connected Apps related list, click New.
In the Connected App Name field, enter Shipify.
In the Contact Email field, enter your email address.
In the API (Enable OAuth Settings) section, select Enable OAuth Settings.
In the Callback URL field, paste the URL of the Heroku app you just created and change the protocol to https. For example, your final URL should look something like https://deep-samurai-7923.herokuapp.com.
In the Selected OAuth Scopes field, select Full access and click Add. As a best practice, you’ll want to keep the OAuth scopes as limited as needed for your canvas app functionality.
In the Canvas App Settings section, select Force.com Canvas.
In the Canvas App URL field, enter the same URL you entered in the Callback URL field with /signedrequest appended to it. For example, the URL might look like https://deep-samurai-7923.herokuapp.com/signedrequest.
In the Access Method drop-down list, select Signed Request (POST).
In the Locations field, select Chatter Tab and Publisher and click Add. For a canvas app to appear in the publisher, you only need to specify a location of Publisher. In this scenario, we also chose Chatter Tab to be able to easily test the canvas app by looking at the Chatter tab.
Select Create Actions Automatically. Selecting this field creates a global custom action for the canvas app.
Click Save. After the canvas app is saved, the detail page appears.

We added the canvas app, and now we’ll specify who can access it.

Salesforce1 App Developer Guide